SVG graphical components can be made linkable by wrapping them in a elements. Linked elements
should always include an xlink:title attribute identifying the nature of the referenced
resource.
That certain graphical components are linkable, and others not, also needs to be established for readers that may have to zoom the image or otherwise may not be able to ascertain which components are linked.
<a href="http://www.ontario.ca"
xlink:title="Ontario government web site">
<g …>
<title>Province of Ontario</title>
…
</g>
</a>